LONG CARBON-CHAIN MOLECULES AND THEIR ANIONS IN THE STARLESS CORE, LUPUS-1A
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)
- National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)
- Institute of Astronomy, University of Tokyo, Osawa, Mitaka, Tokyo 181-8588 (Japan)
We have recently discovered a new starless core with bright radio emissions of long carbon-chain molecules in the Lupus molecular cloud, which we have named as Lupus-1A. Toward this source, the peak intensities of the C{sub 6}H and C{sub 8}H lines are found to be higher than toward TMC-1 by a factor of 2-3. Even the lines of their anions, C{sub 6}H{sup -} and C{sub 8}H{sup -}, are also brighter than in TMC-1. Moreover, the line of C{sub 4}H{sup -} has been detected for the first time in a starless core. The column densities of these long carbon-chain molecules are almost comparable to those in TMC-1, and hence, this source can be regarded as the second 'TMC-1 like cloud'. TMC-1 has long been an outstanding molecular cloud with rich carbon-chain molecules since its discovery in 1976. In spite of extensive efforts, no comparable sources have been found so far. Lupus-1A will be used for hunting of new interstellar molecules as well as understanding of carbon-chain chemistry through critical comparison of physical and chemical properties with TMC-1. This source is important not only for astronomy but also for molecular science as an ideal spectroscopic laboratory because of narrow line shapes and bright intensities.
- OSTI ID:
- 21451018
- Journal Information:
- Astrophysical Journal Letters, Vol. 718, Issue 2; Other Information: DOI: 10.1088/2041-8205/718/2/L49; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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